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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     string s; cin >> s;
  6.     bool flag = false;
  7.     for (int i = 0; i < s.size(); i++) {
  8.         if (s[i] != '4' || s[i] != '7') flag = true;
  9.     }
  10.     if (flag) cout << "NO" << endl;
  11.     else cout << "YES" << endl;
  12. }
  13.  
Success #stdin #stdout 0s 5324KB
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stdin
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Standard input is empty
stdout
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YES
https://ideone.com/XGdkCL
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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